Improvement in hot-air furnaces



tacoma ROYAL r. BROWN, or| OHIOAGO, ILLINOIS.

Letters Patent No. 108,754, dated November 1, 1870. I

IMPROVEMENT IN HOT-AIR FURNACES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern:

Be it known that I, ROYAL F.B1 .OwN,of Chicago,

in the county of Cook and State of Illinois, have invented -a new anduseful Improvement inHot-air Furnaces; and I do declare that thefollowing is a true and accurate description thereof, reference beinghad to the accompanying drawing and to the letters of reference markedthereon, and being a part of this speciication, in which- Figure 1 is avertical section of my improvedfnrnace;

Figure 2 is a cross-section on the line a: a' in iig. l;

Figure 3 vis a crosssection on the line y yin the same figure.

Figure 4 is a detached elevation 'of the damper, enlarged, to show themethod of operating it; and

Figure 5 is a cross-section of the gas-burner.

Like letters indicate like parts in each figure.

The nature of this invention relates to an improvement in theconstruction of hot-air furnaces, and consists in the improvedconstruction and arrangement of its several parts, as more fullyhereinafter set forth.

A represents an open annular base, supported by proper feet.

B is a sheet-metal' easing, whose lower end covers the vertical ange of`the base.

C is the ash-pit, to which access is had' through the door C' in thecasing.

In the rear end of the ash-pit is a bracket, D, on which is mounted thecircular grate E, provided with a handle, E', projecting toward thedoor, and'supported by a hook, c, depending from the top of the ash-pit.l v

The grate is also supported at one side by a lug cast in the side of theash-pit, and its pivot, after passing down through the bracket, iscurved, so that, by partially rotating the grate, until the handle isout ot' the hook, the grate may be turned up edgewise, to dump thecontents of the fire-pot.

F is the lire-pot, which is supplied through the feeddoor Gr in theease. y

H is annular plate resting on the edge of the firepot.

I is the exterior wall of the smoke-chamber, rising from the outerperiphery ot' said plate, from which rise also the air-pipes J, inclinedinwardly.

K is a diaphragm-plate, provided with a central opening. rIhe plateK-rests on the air-pipes which pass through it.

I is the inner wall of the smoke-chamber, with its lower end resting onthe periphery of the plate K.

4The annular smoke-chamber is inclosed atthe top by an annular plate,Iz, laid ou the top ends oi' the wallsI I.

L is a cylindrical radiator,.placed on the plate K, within the circleformed by the mouths of the air- `pipes J, and is closed at the top bythe plate L'.

M are smoke-ducts, connecting the upper part of Athe smoke-passage withthe lupper part of the interior of the radiator, into which the productsof'combustion are discharged.

N is a flue, depending from the top plate L' nearly to the bottom of theradiating-chamber,,directly over the damper O, pivoted in the opening inthe plate K. At the top of the` flue N is a disohargetlue, N',

through which theremainingproducts. of combustionA finally escape to thechimney, passing through the hotair-charnber I, from which suitablepipes conductA the heated air to the points needed.

The damper is provided, on its npperside, with a curved arm, b the curvebeing perpendicular to its axis, and having the eye oi' the lower arm ofthe bellerank c, .with which engages a rod, el, passingthrough thecasing of the furnace, s o that, by drawing out or pushing in this rod,the damper may be opened or closed.

The door G is sunken deeply inward, extending vnearly to the tire-pot,and through it is inserted a tri-V angular cast-iron pipe, closed at theinner and open at the outer end, forming a gas-burner, Q. This gasbnrnermay be inserted at the edge, or n ear the lirepot, from any other partof the furnace, if desired,

and the burner may be of any convenient form, aL` though the triangularform shown is the preferable one.

The flat side of the pipe isiippermost, and the remaining sides, at theinner section, are perforated lwith a series of small holes, throughwhich air enters O, which allows the smoke and gases of combustion topass to the chimney, through the tlues N N'. iVhen the fuel is fullyignited the damper is closed, when the gases, which are ignited-by theairintroduced through Vthe perforated'gas-burner, pass into the annularchamber between the walls I-I, thence through the ducts M, into theradiating-chamber L,

Vbeing reverted to the bottoni thereof before finding exit through theiiue N, the cold air entering'the heater through -the open base. Aportion` passes up aroundthe-walls I, which impart to it the heat of thegases within them. Another portion passes up through,

the air-pipes J, being highly heated by the iiames passing around them.i The air from the pipes passes into the space between the internalwalls ofthe smokepassage-and the walls of -theradiaton where it is stillfurther heated by radiation from each, thus obtaining all the availableheat from the products of combustion before they issue from the furnace.

What I claim as my invention, and desire to secure by Letters Patent, s

The improved construction and arrangement of the several parts of `thefurnace described, consisting of the base A, casing B, ash-pit O, doorC', bracket D, grato E, handle E', and hook fire-pot F, feed-door G,plate H, smoke-cl1amber I Il, air-pipes J, daphragm K, plate I2,radiator L, and plate L', smokeducts- M, lines N N', damper 0, with armb, bellcrank c, and rod d, chamber l, and detachable gashurnerQ.

ROYAL FpBROWN.

Witnesses:

HARRY'S. SPRAGUE, SAMUEL E. J ONES.

